Update index.mdx

src/pages/index.mdx

@@ -146,22 +146,27 @@ import {
     timeline={[
       {
         period: '2018 Q1',
+        borderStyle: 'solid',
         description: "Nimbus team founded",
       },
       {
         period: '2018 Q4',
+        borderStyle: 'dashed',
         description: 'Proof-of-stake client dev begins',
       },
       {
         period: '2019 Q1',
+        borderStyle: 'solid',
         description: 'Nimbus launches to testnet',
       },
       {
         period: '2019 Q3',
+        borderStyle: 'dashed',
         description: 'Nimbus and Lighthouse run first multi-client testnet',
       },
       {
         period: '2020 Q4',
+        borderStyle: 'dashed',
         description: 'Runs 144 validators at Beacon Chain mainnet launch',
       },
       {
@@ -176,7 +181,6 @@ import {
       },
       {
         period: '2023 Plus',
-        borderStyle: 'dashed',
         description: 'Deving one-click install, component redundancy',
       },
     ]}
@@ -214,4 +218,4 @@ import {
     href="https://logos.co/"
     target="_blank"
   />
-</Box>
+</Box>